The Shurikens, made from forged iron with strong points, are the most famous weapon of the Ninjas. As the they were easy to carry around and because they didn’t produce any sound, and also for easy use (especially the flat type that were simply thrown to the enemies without measuring the distance), the Ninjas frequently used the Shurikens. There were four types of Shurikens; a stick type, a flat type, a cross type and a two-layer flat type.
How to throw a Shuriken
Shurikens were thrown in a way to rotate in the air. And when a Shuriken hits an enemy, it was best to be in a vertical position against the enemy’s body.
Also as it was natural for anybody to possess nails, the Ninja sometimes used nails as Shurikens.